#pragma once

#include "DeprecationUtils.h"
#include "TextBasedProtocol.h"
#include <string>
#include <exception>

/// @file

/**
 * \namespace pcpp
 * \brief The main namespace for the PcapPlusPlus lib
 */
namespace pcpp
{

	/**
	 * An enum for HTTP version
	 */
	enum HttpVersion
	{
		/** HTTP/0.9 */
		ZeroDotNine,
		/** HTTP/1.0 */
		OneDotZero,
		/** HTTP/1.1 */
		OneDotOne,
		/** Unknown HTTP version */
		HttpVersionUnknown
	};

	// some popular HTTP fields

	/** Host field */
#define PCPP_HTTP_HOST_FIELD "Host"
	/** Connection field */
#define PCPP_HTTP_CONNECTION_FIELD "Connection"
	/** User-Agent field */
#define PCPP_HTTP_USER_AGENT_FIELD "User-Agent"
	/** Referer field */
#define PCPP_HTTP_REFERER_FIELD "Referer"
	/** Accept field */
#define PCPP_HTTP_ACCEPT_FIELD "Accept"
	/** Accept-Encoding field */
#define PCPP_HTTP_ACCEPT_ENCODING_FIELD "Accept-Encoding"
	/** Accept-Language field */
#define PCPP_HTTP_ACCEPT_LANGUAGE_FIELD "Accept-Language"
	/** Cookie field */
#define PCPP_HTTP_COOKIE_FIELD "Cookie"
	/** Content-Length field */
#define PCPP_HTTP_CONTENT_LENGTH_FIELD "Content-Length"
	/** Content-Encoding field */
#define PCPP_HTTP_CONTENT_ENCODING_FIELD "Content-Encoding"
	/** Content-Type field */
#define PCPP_HTTP_CONTENT_TYPE_FIELD "Content-Type"
	/** Transfer-Encoding field */
#define PCPP_HTTP_TRANSFER_ENCODING_FIELD "Transfer-Encoding"
	/** Server field */
#define PCPP_HTTP_SERVER_FIELD "Server"

	// -------- classes to be defined later -----------------

	class HttpRequestFirstLine;
	class HttpResponseFirstLine;

	// -------- Class HttpMessage -----------------

	/**
	 * @class HttpMessage
	 * Represents a general HTTP message. It's an abstract class and cannot be instantiated. It's inherited by
	 * HttpRequestLayer and HttpResponseLayer
	 */
	class HttpMessage : public TextBasedProtocolMessage
	{
	public:
		virtual ~HttpMessage()
		{}

		/**
		 * A static method that checks whether the port is considered as HTTP
		 * @param[in] port The port number to be checked
		 * @return True if the port matches those associated with the HTTP protocol
		 */
		static bool isHttpPort(uint16_t port)
		{
			return port == 80 || port == 8080;
		}

		// overridden methods

		virtual HeaderField* addField(const std::string& fieldName, const std::string& fieldValue);
		virtual HeaderField* addField(const HeaderField& newField);
		virtual HeaderField* insertField(HeaderField* prevField, const std::string& fieldName,
		                                 const std::string& fieldValue);
		virtual HeaderField* insertField(HeaderField* prevField, const HeaderField& newField);

		OsiModelLayer getOsiModelLayer() const
		{
			return OsiModelApplicationLayer;
		}

	protected:
		HttpMessage(uint8_t* data, size_t dataLen, Layer* prevLayer, Packet* packet)
		    : TextBasedProtocolMessage(data, dataLen, prevLayer, packet)
		{}
		HttpMessage() : TextBasedProtocolMessage()
		{}
		HttpMessage(const HttpMessage& other) : TextBasedProtocolMessage(other)
		{}
		HttpMessage& operator=(const HttpMessage& other)
		{
			TextBasedProtocolMessage::operator=(other);
			return *this;
		}

		// implementation of abstract methods
		char getHeaderFieldNameValueSeparator() const
		{
			return ':';
		}
		bool spacesAllowedBetweenHeaderFieldNameAndValue() const
		{
			return true;
		}
	};

	// -------- Class HttpRequestLayer -----------------

	/**
	 * @class HttpRequestLayer
	 * Represents an HTTP request header and inherits all basic functionality of HttpMessage and
	 * TextBasedProtocolMessage. The functionality that is added for this class is the HTTP first line concept. An HTTP
	 * request has the following first line: <i>GET /bla/blabla.asp HTTP/1.1</i> Since it's not an "ordinary" HTTP
	 * field, it requires a special treatment and gets a class of it's own: HttpRequestFirstLine. Unlike most L2-4
	 * protocols, an HTTP request header can spread over more than 1 packet. PcapPlusPlus currently doesn't support a
	 * header that is spread over more than 1 packet so in such cases: 1) only the first packet will be parsed as
	 * HttpRequestLayer (the other packets won't be recognized as HttpRequestLayer) and 2) the HTTP header for the first
	 * packet won't be complete (as it continues in the following packets), this why PcapPlusPlus can indicate that HTTP
	 * request header is complete or not(doesn't end with "\r\n\r\n" or "\n\n") using HttpMessage#isHeaderComplete()
	 */
	class HttpRequestLayer : public HttpMessage
	{
		friend class HttpRequestFirstLine;

	public:
		/**
		 * HTTP request methods
		 */
		enum HttpMethod
		{
			/** GET */
			HttpGET,
			/** HEAD */
			HttpHEAD,
			/** POST */
			HttpPOST,
			/** PUT */
			HttpPUT,
			/** DELETE */
			HttpDELETE,
			/** TRACE */
			HttpTRACE,
			/** OPTIONS */
			HttpOPTIONS,
			/** CONNECT */
			HttpCONNECT,
			/** PATCH */
			HttpPATCH,
			/** Unknown HTTP method */
			HttpMethodUnknown
		};

		/** A constructor that creates the layer from an existing packet raw data
		 * @param[in] data A pointer to the raw data
		 * @param[in] dataLen Size of the data in bytes
		 * @param[in] prevLayer A pointer to the previous layer
		 * @param[in] packet A pointer to the Packet instance where layer will be stored in
		 */
		HttpRequestLayer(uint8_t* data, size_t dataLen, Layer* prevLayer, Packet* packet);

		/**
		 * A constructor that allocates a new HTTP request header with only the first line filled. Object will be
		 * created without further fields. The user can then add fields using addField() methods
		 * @param[in] method The HTTP method used in this HTTP request
		 * @param[in] uri The URI of the first line
		 * @param[in] version HTTP version to be used in this request
		 */
		HttpRequestLayer(HttpMethod method, const std::string& uri, HttpVersion version);

		virtual ~HttpRequestLayer();

		/**
		 * A copy constructor for this layer. This copy constructor inherits base copy constructor
		 * HttpMessage#HttpMessage() and add the functionality of copying the first line as well
		 * @param[in] other The instance to copy from
		 */
		HttpRequestLayer(const HttpRequestLayer& other);

		/**
		 * An assignment operator overload for this layer. This method inherits base assignment operator
		 * HttpMessage#operator=() and add the functionality of copying the first line as well
		 * @param[in] other The instance to copy from
		 * @return A reference to the assignee
		 */
		HttpRequestLayer& operator=(const HttpRequestLayer& other);

		/**
		 * @return A pointer to the first line instance for this message
		 */
		HttpRequestFirstLine* getFirstLine() const
		{
			return m_FirstLine;
		}

		/**
		 * The URL is hostname+uri. So given the following URL, for example: "www.cnn.com/main.html", the hostname is
		 * "www.cnn.com" and the URI is "/.main.html". URI and hostname are split to 2 different places inside the HTTP
		 * request packet: URI is in the first line and hostname is in "HOST" field. This methods concatenates the
		 * hostname and URI to the full URL
		 * @return The URL of the HTTP request message
		 */
		std::string getUrl() const;

		// implement Layer's abstract methods
		std::string toString() const;

	private:
		HttpRequestFirstLine* m_FirstLine;
	};

	// -------- Class HttpResponseStatusCode -----------------

	/**
	 * @struct HttpResponseStatusCode
	 * @brief The enum wrapper class of HTTP response status codes
	 */
	class HttpResponseStatusCode
	{
	public:
		/**
		 * @brief Define enum types and the corresponding int values
		 */
		enum Value : int
		{
			/** 100 Continue*/
			Http100Continue = 100,
			/** 101 Switching Protocols*/
			Http101SwitchingProtocols = 101,
			/** 102 Processing */
			Http102Processing = 102,
			/** 103 Early Hints */
			Http103EarlyHints = 103,
			/** 104-199 Unassigned */

			/** 200 OK */
			Http200OK = 200,
			/** 201 Created */
			Http201Created = 201,
			/** 202 Accepted */
			Http202Accepted = 202,
			/** 203 Non-Authoritative Information */
			Http203NonAuthoritativeInformation = 203,
			/** 204 No Content*/
			Http204NoContent = 204,
			/** 205 Reset Content*/
			Http205ResetContent = 205,
			/** 206 Partial Content */
			Http206PartialContent = 206,
			/** 207 Multi-Status */
			Http207MultiStatus = 207,
			/** 208 Already Reported */
			Http208AlreadyReported = 208,
			/** 209-225 Unassigned */
			/** 226 IM Used */
			Http226IMUsed = 226,
			/** 227-299 Unassigned */

			/** 300 Multiple Choices */
			Http300MultipleChoices = 300,
			/** 301 Moved Permanently */
			Http301MovedPermanently = 301,
			/** 302 (various messages) */
			Http302 = 302,
			/** 303 See Other */
			Http303SeeOther = 303,
			/** 304 Not Modified */
			Http304NotModified = 304,
			/** 305 Use Proxy */
			Http305UseProxy = 305,
			/** 306 Switch Proxy */
			Http306SwitchProxy = 306,
			/** 307 Temporary Redirect */
			Http307TemporaryRedirect = 307,
			/** 308 Permanent Redirect, */
			Http308PermanentRedirect = 308,
			/** 309-399 Unassigned */

			/** 400 Bad Request */
			Http400BadRequest = 400,
			/** 401 Unauthorized */
			Http401Unauthorized = 401,
			/** 402 Payment Required */
			Http402PaymentRequired = 402,
			/** 403 Forbidden */
			Http403Forbidden = 403,
			/** 404 Not Found */
			Http404NotFound = 404,
			/** 405 Method Not Allowed */
			Http405MethodNotAllowed = 405,
			/** 406 Not Acceptable */
			Http406NotAcceptable = 406,
			/** 407 Proxy Authentication Required */
			Http407ProxyAuthenticationRequired = 407,
			/** 408 Request Timeout */
			Http408RequestTimeout = 408,
			/** 409 Conflict */
			Http409Conflict = 409,
			/** 410 Gone */
			Http410Gone = 410,
			/** 411 Length Required */
			Http411LengthRequired = 411,
			/** 412 Precondition Failed */
			Http412PreconditionFailed = 412,
			/** 413 RequestEntity Too Large */
			Http413RequestEntityTooLarge = 413,
			/** 414 Request-URI Too Long */
			Http414RequestURITooLong = 414,
			/** 415 Unsupported Media Type */
			Http415UnsupportedMediaType = 415,
			/** 416 Requested Range Not Satisfiable */
			Http416RequestedRangeNotSatisfiable = 416,
			/** 417 Expectation Failed */
			Http417ExpectationFailed = 417,
			/** 418 I'm a teapot */
			Http418ImATeapot = 418,
			/** 419 Authentication Timeout */
			Http419AuthenticationTimeout = 419,
			/** 420 (various messages) */
			Http420 = 420,
			/** 421 Misdirected Request */
			Http421MisdirectedRequest = 421,
			/** 422 Unprocessable Entity */
			Http422UnprocessableEntity = 422,
			/** 423 Locked */
			Http423Locked = 423,
			/** 424 Failed Dependency */
			Http424FailedDependency = 424,
			/** 425 Too Early */
			Http425TooEarly = 425,
			/** 426 Upgrade Required */
			Http426UpgradeRequired = 426,
			/** 427 Unassigned */
			/** 428 Precondition Required */
			Http428PreconditionRequired = 428,
			/** 429 Too Many Requests */
			Http429TooManyRequests = 429,
			/** 430 Unassigned */
			/** 431 Request Header Fields Too Large */
			Http431RequestHeaderFieldsTooLarge = 431,
			/** 432-439 unassigned */
			/** 440 Login Timeout */
			Http440LoginTimeout = 440,
			/** 441-443 unassigned */
			/** 444 No Response */
			Http444NoResponse = 444,
			/** 445-448 unassigned */
			/** 449 Retry With */
			Http449RetryWith = 449,
			/** 450 Blocked by Windows Parental Controls */
			Http450BlockedByWindowsParentalControls = 450,
			/** 451 (various messages) */
			Http451 = 451,
			/** 452-493 unassigned */
			/** 494 Request Header Too Large */
			Http494RequestHeaderTooLarge = 494,
			/** 495 Cert Error */
			Http495CertError = 495,
			/** 496 No Cert */
			Http496NoCert = 496,
			/** 497 HTTP to HTTPS */
			Http497HTTPtoHTTPS = 497,
			/** 498 Token expired/invalid */
			Http498TokenExpiredInvalid = 498,
			/** 499 (various messages) */
			Http499 = 499,

			/** 500 Internal Server Error */
			Http500InternalServerError = 500,
			/** 501 Not Implemented */
			Http501NotImplemented = 501,
			/** 502 Bad Gateway */
			Http502BadGateway = 502,
			/** 503 Service Unavailable */
			Http503ServiceUnavailable = 503,
			/** 504 Gateway Timeout */
			Http504GatewayTimeout = 504,
			/** 505 HTTP Version Not Supported */
			Http505HTTPVersionNotSupported = 505,
			/** 506 Variant Also Negotiates */
			Http506VariantAlsoNegotiates = 506,
			/** 507 Insufficient Storage */
			Http507InsufficientStorage = 507,
			/** 508 Loop Detected */
			Http508LoopDetected = 508,
			/** 509 Bandwidth Limit Exceeded */
			Http509BandwidthLimitExceeded = 509,
			/** 510 Not Extended */
			Http510NotExtended = 510,
			/** 511 Network Authentication Required */
			Http511NetworkAuthenticationRequired = 511,
			/** 512-519 unassigned */
			/** 520 Origin Error */
			Http520OriginError = 520,
			/** 521 Web server is down */
			Http521WebServerIsDown = 521,
			/** 522 Connection timed out */
			Http522ConnectionTimedOut = 522,
			/** 523 Proxy Declined Request */
			Http523ProxyDeclinedRequest = 523,
			/** 524 A timeout occurred */
			Http524aTimeoutOccurred = 524,
			/** 525-597 unassigned */
			/** 598 Network read timeout error */
			Http598NetworkReadTimeoutError = 598,
			/** 599 Network connect timeout error */
			Http599NetworkConnectTimeoutError = 599,

			// clang-format off
			/** Unknown status code */
			HttpStatus1xxCodeUnknown = 900001, // 1xx: Informational - Request received, continuing process
			HttpStatus2xxCodeUnknown = 900002, // 2xx: Success - The action was successfully received, understood, and accepted
			HttpStatus3xxCodeUnknown = 900003, // 3xx: Redirection - Further action must be taken in order to complete the request
			HttpStatus4xxCodeUnknown = 900004, // 4xx: Client Error - The request contains bad syntax or cannot be fulfilled
			HttpStatus5xxCodeUnknown = 900005, // 5xx: Server Error - The server failed to fulfill an apparently valid request
			HttpStatusCodeUnknown = 999999,    // other arbitrary number
			// clang-format on
		};

		HttpResponseStatusCode() = default;

		// cppcheck-suppress noExplicitConstructor
		/**
		 * @brief Construct HttpResponseStatusCode from Value enum
		 * @param[in] statusCode the status code enum
		 */
		HttpResponseStatusCode(Value statusCode) : m_Value(statusCode)
		{}

		/**
		 * @brief Construct HttpResponseStatusCode from the code number and the customized message
		 * @param[in] statusCodeNumber the status code in number, e.g. 200, 404
		 * @param[in] statusMessage the status message, optional, leave empty to use a default message
		 */
		explicit HttpResponseStatusCode(const int& statusCodeNumber, const std::string& statusMessage = "");

		/**
		 * @brief Construct HttpResponseStatusCode from Value enum and the customized message
		 * @param[in] statusCode the status code enum
		 * @param[in] statusMessage the customized status message, optional
		 */
		explicit HttpResponseStatusCode(const Value& statusCode, const std::string& statusMessage);

		// Allow switch and comparisons.
		operator Value() const
		{
			return m_Value;
		}
		// Prevent usage: if(httpResponseStatusCode)
		explicit operator bool() const = delete;

		/**
		 * @brief get status code number as string
		 */
		std::string toString() const
		{
			return std::to_string(m_Value);
		}

		/**
		 * @brief get status code number as int
		 */
		int toInt() const
		{
			return static_cast<int>(m_Value);
		}

		/**
		 * @brief get status code message, e.g. "OK", "Not Found"
		 */
		std::string getMessage() const;
		/**
		 * @return If this HttpResponseStatusCode a valid code
		 * @note Any unknown or error code has an extreme large enum value
		 */
		bool isUnsupportedCode() const
		{
			return m_Value > 599;
		}

	private:
		Value m_Value = HttpStatusCodeUnknown;
		std::string m_CustomizedMessage;
	};

	// -------- Class HttpResponseLayer -----------------

	/**
	 * @class HttpResponseLayer
	 * Represents an HTTP response header and inherits all basic functionality of HttpMessage and
	 * TextBasedProtocolMessage. The functionality that is added for this class is the HTTP first line concept. An HTTP
	 * response has the following first line: <i>200 OK HTTP/1.1</i> Since it's not an "ordinary" HTTP field, it
	 * requires a special treatment and gets a class of it's own: HttpResponseFirstLine. Unlike most L2-4 protocols, an
	 * HTTP response header can spread over more than 1 packet. PcapPlusPlus currently doesn't support a header that is
	 * spread over more than 1 packet so in such cases: 1) only the first packet will be parsed as HttpResponseLayer
	 * (the other packets won't be recognized as HttpResponseLayer) and 2) the HTTP header for the first packet won't be
	 * complete (as it continues in the following packets), this why PcapPlusPlus can indicate that HTTP response header
	 * is complete or not (doesn't end with "\r\n\r\n" or "\n\n") using HttpMessage#isHeaderComplete()
	 */
	class HttpResponseLayer : public HttpMessage
	{
		friend class HttpResponseFirstLine;

	public:
		// backward compatibility
		using HttpResponseStatusCode = pcpp::HttpResponseStatusCode;

		/** A constructor that creates the layer from an existing packet raw data
		 * @param[in] data A pointer to the raw data
		 * @param[in] dataLen Size of the data in bytes
		 * @param[in] prevLayer A pointer to the previous layer
		 * @param[in] packet A pointer to the Packet instance where layer will be stored in
		 */
		HttpResponseLayer(uint8_t* data, size_t dataLen, Layer* prevLayer, Packet* packet);

		/**
		 * A constructor that allocates a new HTTP response header with only the first line filled. Object will be
		 * created without further fields. The user can then add fields using addField() methods
		 * @param[in] version HTTP version to be used
		 * @param[in] statusCode Status code to be used
		 * @param[in] statusCodeString Most status codes have their default string, e.g 200 is usually "OK", 404 is
		 * usually "Not Found", etc. But the user can set a non-default status code string and it will be written in the
		 * header first line. Empty string ("") means using the default status code string
		 * @deprecated Use other constructors instead.
		 */
		PCPP_DEPRECATED("Use other constructors instead")
		explicit HttpResponseLayer(HttpVersion version, const HttpResponseStatusCode& statusCode,
		                           const std::string& statusCodeString);

		/**
		 * A constructor that allocates a new HTTP response header with only the first line filled. Object will be
		 * created without further fields. The user can then add fields using addField() methods
		 * @param[in] version HTTP version to be used
		 * @param[in] statusCode Status code to be used
		 */
		explicit HttpResponseLayer(HttpVersion version, const HttpResponseStatusCode& statusCode);

		virtual ~HttpResponseLayer();

		/**
		 * A copy constructor for this layer. This copy constructor inherits base copy constructor
		 * HttpMessage#HttpMessage() and adds the functionality of copying the first line as well
		 * @param[in] other The instance to copy from
		 */
		HttpResponseLayer(const HttpResponseLayer& other);

		/**
		 * An assignment operator overload for this layer. This method inherits base assignment operator
		 * HttpMessage#operator=() and adds the functionality of copying the first line as well
		 * @param[in] other The instance to copy from
		 * @return A reference to the assignee
		 */
		HttpResponseLayer& operator=(const HttpResponseLayer& other);

		/**
		 * @return A pointer to the first line instance for this message
		 */
		HttpResponseFirstLine* getFirstLine() const
		{
			return m_FirstLine;
		}

		/**
		 * The length of the body of many HTTP response messages is determined by a HTTP header field called
		 * "Content-Length". This method sets The content-length field value. The method supports several cases:
		 *   - If the "Content-Length" field exists - the method will only replace the existing value with the new value
		 *   - If the "Content-Length" field doesn't exist - the method will create this field and put the value in it.
		 * Here are also 2 cases:
		 *   - If prevFieldName is specified - the new "Content-Length" field will be created after it
		 *   - If prevFieldName isn't specified or doesn't exist - the new "Content-Length" field will be created as the
		 * last field before end-of-header field
		 *
		 * @param[in] contentLength The content length value to set
		 * @param[in] prevFieldName Optional field, if specified and "Content-Length" field doesn't exist, it will be
		 * created after it
		 * @return A pointer to the "Content-Length" field, or NULL if creation failed for some reason
		 */
		HeaderField* setContentLength(int contentLength, const std::string& prevFieldName = "");

		/**
		 * The length of the body of many HTTP response messages is determined by a HTTP header field called
		 * "Content-Length". This method parses this field, extracts its value and return it. If this field doesn't
		 * exist the method will return 0
		 * @return HTTP response body length determined by "Content-Length" field
		 */
		int getContentLength() const;

		// implement Layer's abstract methods

		std::string toString() const;

	private:
		HttpResponseFirstLine* m_FirstLine;
	};

	// -------- Class HttpRequestFirstLine -----------------

	/**
	 * @class HttpRequestFirstLine
	 * Represents an HTTP request header first line. The first line includes 3 parameters: HTTP method (e.g GET, POST,
	 * etc.), URI (e.g /main/index.html) and HTTP version (e.g HTTP/1.1). All these parameters are included in this
	 * class, and the user can retrieve or set them. This class cannot be instantiated by users, it's created inside
	 * HttpRequestLayer and user can get a pointer to an instance of it. All "get" methods of this class will retrieve
	 * the actual data of the HTTP request and the "set" methods will change the packet data. Since HTTP is a textual
	 * protocol, most fields aren't of fixed size and this also applies to the first line parameters. So most "set"
	 * methods of this class need in most cases to shorten or extend the data in HttpRequestLayer. These methods will
	 * return a false value if this action failed
	 */
	class HttpRequestFirstLine
	{
		friend class HttpRequestLayer;

	public:
		/**
		 * @return The HTTP method
		 */
		HttpRequestLayer::HttpMethod getMethod() const
		{
			return m_Method;
		}

		/**
		 * Set the HTTP method
		 * @param[in] newMethod The method to set
		 * @return False if newMethod is HttpRequestLayer#HttpMethodUnknown or if shortening/extending the
		 * HttpRequestLayer data failed. True otherwise
		 */
		bool setMethod(HttpRequestLayer::HttpMethod newMethod);

		/**
		 * @return A copied version of the URI (notice changing the return value won't change the actual data of the
		 * packet)
		 */
		std::string getUri() const;

		/**
		 * Set the URI
		 * @param[in] newUri The URI to set
		 * @return False if shortening/extending the HttpRequestLayer data failed. True otherwise
		 */
		bool setUri(std::string newUri);

		/**
		 * @return The HTTP version
		 */
		HttpVersion getVersion() const
		{
			return m_Version;
		}

		/**
		 * Set the HTTP version. This method doesn't return a value since all supported HTTP versions are of the same
		 * size (HTTP/0.9, HTTP/1.0, HTTP/1.1)
		 * @param[in] newVersion The HTTP version to set
		 */
		void setVersion(HttpVersion newVersion);

		/**
		 * A static method for parsing the HTTP method out of raw data
		 * @param[in] data The raw data
		 * @param[in] dataLen The raw data length
		 * @return The parsed HTTP method
		 */
		static HttpRequestLayer::HttpMethod parseMethod(const char* data, size_t dataLen);

		/**
		 * @return The size in bytes of the HTTP first line
		 */
		int getSize() const
		{
			return m_FirstLineEndOffset;
		}

		/**
		 * As explained in HttpRequestLayer, an HTTP header can spread over more than 1 packet, so when looking at a
		 * single packet the header can be partial. Same goes for the first line - it can spread over more than 1
		 * packet. This method returns an indication whether the first line is partial
		 * @return False if the first line is partial, true if it's complete
		 */
		bool isComplete() const
		{
			return m_IsComplete;
		}

		/**
		 * @class HttpRequestFirstLineException
		 * This exception can be thrown while constructing HttpRequestFirstLine (the constructor is private, so the
		 * construction happens only in HttpRequestLayer). This kind of exception will be thrown if trying to construct
		 * with HTTP method of HttpRequestLayer#HttpMethodUnknown or with undefined HTTP version ::HttpVersionUnknown
		 */
		class HttpRequestFirstLineException : public std::exception
		{
		public:
			~HttpRequestFirstLineException() throw()
			{}
			void setMessage(const std::string& message)
			{
				m_Message = message;
			}
			virtual const char* what() const throw()
			{
				return m_Message.c_str();
			}

		private:
			std::string m_Message;
		};

	private:
		HttpRequestFirstLine(HttpRequestLayer* httpRequest);
		HttpRequestFirstLine(HttpRequestLayer* httpRequest, HttpRequestLayer::HttpMethod method, HttpVersion version,
		                     const std::string& uri = "/");

		void parseVersion();

		HttpRequestLayer* m_HttpRequest;
		HttpRequestLayer::HttpMethod m_Method;
		HttpVersion m_Version;
		int m_VersionOffset;
		int m_UriOffset;
		int m_FirstLineEndOffset;
		bool m_IsComplete;
		HttpRequestFirstLineException m_Exception;
	};

	// -------- Class HttpResponseFirstLine -----------------

	/**
	 * @class HttpResponseFirstLine
	 * Represents an HTTP response header first line. The first line includes 2 parameters: status code (e.g 200 OK, 404
	 * Not Found, etc.), and HTTP version (e.g HTTP/1.1). These 2 parameters are included in this class, and the user
	 * can retrieve or set them. This class cannot be instantiated by users, it's created inside HttpResponseLayer and
	 * user can get a pointer to an instance of it. The "get" methods of this class will retrieve the actual data of the
	 * HTTP response and the "set" methods will change the packet data. Since HTTP is a textual protocol, most fields
	 * aren't of fixed size and this also applies to the first line parameters. So most "set" methods of this class need
	 * in most cases to shorten or extend the data in HttpResponseLayer. These methods will return a false value if this
	 * action failed
	 */
	class HttpResponseFirstLine
	{
		friend class HttpResponseLayer;

	public:
		/**
		 * @return The status code as HttpResponseStatusCode enum
		 */
		HttpResponseStatusCode getStatusCode() const
		{
			return m_StatusCode;
		}

		/**
		 * @return The status code number as integer (e.g 200, 404, etc.)
		 */
		int getStatusCodeAsInt() const;

		/**
		 * @return The status code message (e.g "OK", "Not Found", etc.)
		 */
		std::string getStatusCodeString() const;

		/**
		 * Set the status code
		 * @param[in] newStatusCode The new status code to set
		 * @param[in] statusCodeString An optional parameter: set a non-default status code message (e.g "Bla Bla"
		 * instead of "Not Found"). If this parameter isn't supplied or supplied as empty string (""), the default
		 * message for the status code will be set
		 * @return True if setting the status code was completed successfully, false otherwise
		 * @deprecated Use the other overload instead.
		 */
		PCPP_DEPRECATED("Use the other overload instead")
		bool setStatusCode(const HttpResponseStatusCode& newStatusCode, const std::string& statusCodeString);

		/**
		 * Set the status code
		 * @param[in] newStatusCode The new status code to set
		 * @return True if setting the status code was completed successfully, false otherwise
		 */
		bool setStatusCode(const HttpResponseStatusCode& newStatusCode);

		/**
		 * @return The HTTP version
		 */
		HttpVersion getVersion() const
		{
			return m_Version;
		}

		/**
		 * Set the HTTP version. This method doesn't return a value since all supported HTTP versions are of the same
		 * size (HTTP/0.9, HTTP/1.0, HTTP/1.1)
		 * @param[in] newVersion The HTTP version to set
		 */
		void setVersion(HttpVersion newVersion);

		/**
		 * A static method for parsing the HTTP status code out of raw data
		 * @param[in] data The raw data
		 * @param[in] dataLen The raw data length
		 * @return The parsed HTTP status code as enum
		 */
		static HttpResponseStatusCode parseStatusCode(const char* data, size_t dataLen);

		/**
		 * A static method for parsing the HTTP version out of raw first line data (e.g "HTTP/x.y")
		 * @param[in] data The raw data
		 * @param[in] dataLen The raw data length
		 * @return The parsed HTTP status code as enum
		 */
		static HttpVersion parseVersion(const char* data, size_t dataLen);

		/**
		 * @return The size in bytes of the HTTP first line
		 */
		int getSize() const
		{
			return m_FirstLineEndOffset;
		}

		/**
		 * As explained in HttpResponseLayer, an HTTP header can spread over more than 1 packet, so when looking at a
		 * single packet the header can be partial. Same goes for the first line - it can spread over more than 1
		 * packet. This method returns an indication whether the first line is partial
		 * @return False if the first line is partial, true if it's complete
		 */
		bool isComplete() const
		{
			return m_IsComplete;
		}

		/**
		 * @class HttpResponseFirstLineException
		 * This exception can be thrown while constructing HttpResponseFirstLine (the constructor is private, so the
		 * construction happens only in HttpResponseLayer). This kind of exception will be thrown if trying to construct
		 * with a HTTP status code that is not in HttpResponseStatusCode or with undefined HTTP version
		 * ::HttpVersionUnknown
		 */
		class HttpResponseFirstLineException : public std::exception
		{
		public:
			~HttpResponseFirstLineException() throw()
			{}
			void setMessage(const std::string& message)
			{
				m_Message = message;
			}
			virtual const char* what() const throw()
			{
				return m_Message.c_str();
			}

		private:
			std::string m_Message;
		};

	private:
		HttpResponseFirstLine(HttpResponseLayer* httpResponse);
		HttpResponseFirstLine(HttpResponseLayer* httpResponse, HttpVersion version,
		                      const HttpResponseStatusCode& statusCode);

		HttpResponseLayer* m_HttpResponse;
		HttpVersion m_Version;
		HttpResponseStatusCode m_StatusCode;
		int m_FirstLineEndOffset;
		bool m_IsComplete;
		HttpResponseFirstLineException m_Exception;
	};

}  // namespace pcpp
